Abstract
The study of a physically mixed Ga 2O 3/HZSM-5 catalyst shows that propene aromatization on the catalyst may be improved by activating it in hydrogen at high temperature. The optimal pretreatment conditions are at 773 K in hydrogen for 2 h and about 1 wt.-% Ga content. Ga III in Ga 2O 3/HZSM-5 catalyst cannot be reduced by the high temperature pretreatment in hydrogen. The enhancement of propene aromatization on the catalyst may be due to the migration of gallium species, possibly into the channels of the zeolite, and the improvement of hydrogen transfer properties of the catalyst. The hydrogen adsorption-desorption process is completely reversible.
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